Machine for rolling metallic disks



E. A. NELSON MACHINE FOR ROLLING METALLIC DISKS April 10, 1928. 1,665,818

Filed Oct. 2, 1923 6 Sheets-Sheet l a 6g 55 7.9 76 Q: Q Q J 67 v 0 m 75 f; 6.9

4s '7 36' 40 o 0 4s 49 14 I I 1 50 4 11 i I 1 1 I so o 19 1.9 1 31 88 n A f; INVENTOR.

16 EM. A. NELS N WITNESS! I By I m F i flunk/WY.

April 10, 1928. 1,665,818

E A. NELSON MACHINE FOR ROLLING METALLIC DISKS Filed Oct. 2, 1923 6 Sheets-Sheet 2 34 o o f O O .20 a 1 4 g :31! C Z1 c3111 z1 23 f T23 15 15 INVENTOR.

EMIL A. NELSON! WITNESS! PI 3 BY April 10, 1928. 1,665,818

E. A. NELSON MACHINE FOR ROLLING METALLIC DISKS Filed Oct. 2, 1923 6 Sheets-Sheet 3 Emu. A/VELSO'M 1": 3 Nnwsssrj ATTORNEY. v

April 10, 1928.

' 1,665,818 E. A. NELSON MACHINE FOR ROLLING METALLIC DISKS Filed Oct. 2, 1923 s She ets-Sheet 4 41 .u j /Zm/m ,H. A l l IN VEN TOR.

6' MIL 14. NELSON N1 r-5ss:-

Apr-H10. 192a 1,665,818

E. A. NELSON llACflINE FOR ROLLING METALLIC DISKS Filed 001". 2, 1925 6 Sheets-$heet 5 INVENTOR.

EMIL ANELso/v.

N1 rue-s5:

I ATTORNEY.

April 10, 1928. 1,665,818

' E. A. NELSON MACHINE FOR ROLLING METALLIC DISKS Filed Oct. 2, 1925' 6 Sheets-Sheet 6 INVENTOR.

fnu. A. NezsoM A TTORNE Y.

Patented Apr. 10, 1928.

UNITED STATES 1,665,818 PATENT orn-10E.

EMIL 'A. NELSON. OF 'ABINGION, PENNSYLVANIA, ASSIGNOR T0 BUDD WHEEL COM- PANY, OF PHILADELPHIA. PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

'MACHINE FOR ROLLING METALLIC DISKS.

Application filed October 2, 1923. Serial No. 666,122.

My invention relates to improvei'nents in machines for rolling metallic disks and has to do more particularly with disk-rolling machines ot the type in which the disk is mounted on a rotating support and subject ed to the action of rolls which are applied to the disk under pressure and traversed ra- "dially ot the disk as the table rotates.

The chief object of my present invention is to provide'a machine for rolling metallic disks in which the rolls are applied to the nism for applying the rolls to the disk under a spring pressure at predetermined intervals.

A further object of my invention is to provide a disk-rolling machine of the type referred to having cam mechanism tor traversing the rolls radially of: the disk at predetermined intervals aud for causing the rolls to be applied. to the disk, under spring pressure, at suitable intervals in the operation of the machine.

Further objects, and objects relating to details and economies of operation and construction, will definitely appear from the detailed description to follow. In one in stance. I accomplish the objects of my invention by the devi 'es and means set forth in the following specification. My invention is clearly defined and pointed out inthe appended claims. A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawings, forming a part of this specification, in which:

Fig. l is a view in front elevation of a machine embodying my invention.

Fig. 2 is a view of the machine in side elevation.

Fig. 3 is a vertical, sectional view through the machine, taken on the line 3 3 of Fig. 2..

Fig. 4 is an enlarged view, partly in section and oartly in side elevation, of: the rotating table for sinpporting the disk, the rolls and the roll-carriers.

F ig.'5 is a detail, sectional view taken on the line 5-5 of Fig. 1.

Fig. 6 is aview in side elevation of the cams and parts actuated thereby for imparting radial movements to the rolls.

Fig. 7 is a view ot the parts shownfin Fig. 6, looking from the left-hand side of said figure.

Fig. is a view in side elevation ot'the cam and toggle mechanism actuated thereby for raising and lowering the carriageon which the rolls are mounted, and

Fig. 9 is a view of the parts shown in i Fig. 8, looking from the left-hand side of said figure.

In the drawings, the same reference numerals refer to'the sameparts throughout the several views, and the sectional'views are taken looking in the direction ofthe arrowsat the ends of the section lines.

It has been proposed, heretofore, to provide a machine for rolling disks, of the type reterred to, in which the" blank to be rolled is mounted on a rotating table and acted upon by a pair of rolls mounted in roll carriers and supported'by a carriage'so that these rolls may be traversed radially of'the disk. This carriage has been so mounted that it can be positively raised or'lowered so as to facilitate the removal of a'rolled disk'from the table and theteeding of a blank thereto. It has been proposed to move the carriage toward and away fr'om'the table bytoggl-e mechanism connectingthe carriage and points fixed with respect to the frame of the machine, and cam mechanism has been suggested for actuating said toggle mechanism at the proper intervals'and cansingthe rolls to move radially of the disk at proper instants in the operation of the machine.

In general. my invention consists inapplying the rolls to the rotating blank under spring pressure,whieh will permit the rolls to yield somewhat in case of-abnormalvarL ations or'inequalities in the disks or in case ot accidental meeting of the rolls and "the table. and I propose to accomplish the purposes of my invention by providing a carriage'. which may be raised and lowered with respect to the rotating table and which. carries the rolls, and atoggle mechanism "for actuating the carriage which is connected to the carriage and to parts which are not rigidly fixed with respect to the frame of the machine, but are connected thereto through springs, so that spring pressure is impressed upon the toggle mechanism butsuch parts may yield under the spring; pressure in case it should be necessary due to variations in thickness.

Referring to the niunbcrcd parts of the accompanying drawings, in which I have shown a macl'iine constructed in accordance with my invention, the base or frame, 10, of the machine, is provided with columns, 11, at the four corners thereo't. These columns, 11. have a longitiulinal passage therein to receive the guide rods, 14, which extend theretln'ongh and also through the passageways, 12, formed in the base, 10. A bushing, 13, is inserted in each passage, 12. The lower end of each rod. 14. is reduced in diameter forming the smaller lower portion. 15, which'projects below the portion ot the base through which it extends, as shown in Figs. 1, 2 and The bushing. 13. is retained in place by the nut. 17, which is screwed into the lower end of the bushing, and surrounds the reduced portion, 15, ot the rod. 14. The head, 18, of the nut engages thelower end of the bushing. 13, (see Fig. 5) and is provided with suitable apertures to receive a tool by means of which the nut may be adjusted. The shoulder, 16, of the rod, 14, is adapted to engage the upper end of the nut, 17, which thus acts as a stop to limit the downward movement of the rod, 14, with respectto the base or frame of the machine. A loose ring, 19, surrounds the head of the nut, 17, and engages the shoulder, 9,01? the base, 10. The smaller portion. 15, of each rod, 14, extends downwardly through the nut, 17, and through a washer, 20, which engages the lowersurtace of the ring. 19. The portion, 15, of the rod also extends through a second washer, 22, and a comparatively stiff and heavy spring, 21, is interposed between the washers, 20. and 22. the latter bein held in place by the nuts, 23, screwed on the lower end 15 ot the rod, 14. This construction is employed at each of the four corners of the base, 10. and it will be seen that the rods. 14, are not rigidly fixed with respect to the base or fame of the machine, but are connected thereto through "the heavy springs, 21, so that, when a comparatively heavy pressure is applied, these rods may'yield and move with respect to the base.

The rotating table, 24, is provided with a -face, 25, which. is adapted to support the disk, A, and is shaped to conform to the cross-section of the disk which is to be rolled on the machine. The machine illustrated is designed for rolling tapered disks, and the face, 25, is therefore slightly conical and centering pin, 26, which is adapted to extend through a central opening in the disk, A. The table, 24, is mounted so as to rotate freely, being journaled on the base, 10,

' through the roller bearings, 27, and driven by a gear, 28, which is driven tronii shaft, 29, carrying the pulley, 30, over which the belt, 31. runs, said belt being connected with any suitable source of power.

The carriage, 32. is slidably mounted on the guide rods, 14, being provided with vertical bores or passageways at its tour corners through which the rods, 14, extend. The upper ends of the rods, 14, are rigidly connected. by the cross bars, 33, and the cross rods, 34, the latter serving asjournal shaft-s or rods on which certain of the operating parts are journaled. The disk, A, supported on the rotating table, 24, is acted upon by the rolls, 35, each of which has a cylindrical portion, 36, and a 't'rusto-conical portion, 37. These rolls are mountedin roll carriers, 38, which are arranged to slide in the guideways, 39, extending transversely of the lower surface of the carriage, 32. Each roll carrier, 38, has a pair of spaced depending arms, 40 and 41., in which the roll shaft, 42,.is journaled. The inner end of each roll shaft is journaled in a bearing, 4.3, carried by the arm, 40, of the carrier, while the outer end of the roll shaft is journaled in a bearing, 44, carried by a member, 45, secured to the arm, 41. The roll, 35, is tastened to the roll shaft between the. depending arms, 40 and.

41, (see Fig. 4). A cap, 46, is secured to the arm, 41, of each carrier, and to the members, 45, and it has a depending ear, 47; The cars, 47, on the respective caps, 46, are con nected through links, 48, to the threaded pins, 49, which are mounted in the lower ends, 50, of the bell-crank levers, 53, and are adjustably secured thereto by the nuts, 51 and 52.

The bell-crank levers, 53 and 5?), are pivoted on the carriage, 32, at and the arms, 55, of said bell cranks extend inwardly toward each other and are connected to the link, 56, which in turn is connected to the lower end of the link. 57. A rocker, 59. is joiu'naled on a cross-rod 60. carried by the carriage, and. is provided with rollers, (it and 63, which engage the'cdgges ot the cams, 62 and 64. The upper end of the link, 57, is connected to the rocker, 59, at The cams, 62 and 64, are fastened on the cam shatt, 65, which is driven by a worm gear (not shown) housed within the casing, 66. and meshing with a worm (not shown) on the shalt, G7. The latter is driven by belt, ("39, connected with any suitable source of power and running over the pulley, 68. on shaft, (37.

The sleeves or knuckle members. 70, are journaled on the cross-rods, 34, and each sleeve has two pairs of arms, 71. depending concave. The table, 24, is provided With a therefrom and connected by the links, 72, to

ltitl the carriage, 32. An arm; 73,extends up wardly from each ofthe sleeves, 70,-" and the upper ends of these arms are connected by the cross bar, 74. One of thearms, T3, is connected by means of air adjustable-rod, 75, with a rocker member, 76,- whicli is jour naled on the cross rod, 77, supported by the carriage,- 32, and has a pair of rollers, 78 and 79, engaging the edge of cam, 80,-which is fastened onthe cam shaft, 65);

From the foregoing description of the parts. the operation of the machine will readily appear. The disk, A, to be rolled, isplaced uponthe rotating table, 24, with the'centering pin, 26, extending-through the central opening in thedisk. This is done while the carriage, 32, is raised to remove therolls, 35, from the table. \Vhen the disk is in place'on the table the carriage, 32; forced downwardly so as toapply the-rolls, 35,'to the diskunder the pressure of springs, 21, and the roll-carriers are moved' soas to shift the rolls, 35, radially outward of the disk. The carriage, 32, is then released and raised so as to remove the rolls from the disk, and, while the carriage'is raised, the rolls are moved toward each other to their initial position; The cams, (32 and M, op.- erating on the rollers, 61 and ('53, of rocker 59, actuate the'bell cranklevers, 53, 55 to shift the-rolls, 35, radially with respect to the disk. The arms,- 71, onsleeves or knuckle members, 70, together withthe links, 72, forma series of toggle-linkages,

one at each of the four cornersof the-carriage, for forcing the carriage toward the rotating table to apply-the rolls tothe disk under pressure. The cross rods. til, on

' which the sleeves or knuckle'menibers, 70,

are journaled, are not fixed with respect to the frame of the machine since they are connected to the upper ends of the rods, l l, which are yieldingly-connectcd to the frame of the machine through the springs, 21'. lVhen the toggle linkages are straightened out (as shown in Fig.8) the pressure of the springs, 21, is exerted on the carriage, 32, to force the rolls against the disk. Ifthe resistance to the action of the rolls exceeds the pressure of the springs. 21, the cross rods, 34, may yield upwardly. This construction has certaiirdecided advantages in that'it is not necessary to be so careful about variations in thickness of the disks or blanks which are to be rolled in the machine; In. case a blank, which is thicker than those for which the machinehas been set, is inserted in the machine, the springs, 21, will yield, and the blank will be rolled; whereas, if the cross rods, Ell, were fixed, it likely that the machine would be wrecked in the attempt to roll too thick :1 disk.. The toggle linkages are actuated through the arms. 78, by' the rocker, 7 6, the rollers, 78 and 79, on which, are engaged by the cam,

80g'on'the cam shaft,- 65. Theeams, 62, 64 and 80; operateto actuate tl e carriage and roll carriers automatically in a predetermined sequence and at in'edetermined intervals. These cams are such that, assuming the parts to be in-the position shown in Figs. 1 and 2, the rolls, 35, are, first, shifted radiallyoutward with respect to the table. When the rolls reach the limit of their 0utward inovement, there is a slight dwell and,

at that instant, the carriage, 32, is raised. The rolls, 35, are then moved radially to their initial position. It is lobe observed that the-cams are such that the return movementofthe rolls is considerably faster than the. outward movement. WVhen the rollshave' returned to their initial position, the cam, 80, acts on the toggle linkages to move-thecarriage, 32, toward the table and to force the rolls againsttheblank under the working pressure imparted by the springs, 21.

This machine isparticularly suitable for cold-rolling disks or blanks which have been tapered, or given a desired cross section, previously; it has been found that the cold-rolling of such disks'ormetal blanks gives-them a surface which is very desirable for painting, and finishing, even though there'is practically no reduction in thickness ofthe metal or change in cross section. This machine has beenfound to do such cold-rolling very satisfactorily; It is useful, however, in rolling tapered disks or other metal shapes from blanks of uniform cross section. I. have illustrated a cam mechanism for traversing the rolls radially, and raising and lowering the'rolls at proper intervals, but, of course, I am not to be restricted to cam mechanism, as any-other suitable means may be employed for this purpose.

I am aware that the machine for rolling disks which is illustrated'in the accompany iug; drawing may be changed considerably without departing from the spirit of my invention and, therefore, I claim iny invention broadly, as indicated by the appended claims.

Having thus described my invention, what I claim as new and useful and desireto secure by Letters Patent is:

l. A machine of the class described comprising a rotatable support for the blank to be rolled, a roll adapted to act on the blank, means for applying said roll to the upper surface of said blank under spring pressure, and means for traversing said roll radially of theblank.

A machine of the cla s described comprising a rotatably mounted table adapted to support the blank to be rolled. a plurality of rolls, means for applying said rolls to the upper surface of said blank under spring pressure, and means fortraversing said rolls radially of the blank.

3. A machine of the class described coniprising-a support for the blank to be rolled, a roll co-operating with said support, a spring-pressc l toggle vitor maintaining a working pressure between said roll and support during the rolling operation, and means for automatically breakingsaid toggle after the completion ot the operation to permit the removal oi? the rolled blank.

t. A machine of the class described com prising a support for the blank to be rolled, a shi'l'tablc roll co-operating with said support, a. spring-prcsscil toggle for applying pres; irebetween and roll and the support during the rolling operation, and cam means acting automatically at the completion of the rolling operation to break the toggle and permit the removal of the rolled blank.

5. A machine of the class described comprising a support tor the blank to be rolled, a co-operating roll adapted to be moved crosswise of the support in contact with the blank, spring means for maintaining a working pressure between the roll and the support during the rolling imeiiti-iin, and means tor automatically separating said roll and support and restoring the roll to starting position after the completion of each rollin operation.

6. A prising a support -tor the blank to be rolled, a cooperatingroll, means tor moving the roll into contact with the blank and maintaining said roll in contact therewith under spring pressure,means for shifting the roll crosswise of the blank during the rolling operation, and means for automatically causing the raising oi? the roll from the blank after the completion of the rolling operation and the return of the roll to the initial or starting position after having been raised.

7. A machine of the class described comprising a support for the blank to be rolled and a rollcarrying frame movable relatively toward and from each other, a. pair o't rolls carried by the frame, one at each side oi the center of the blank, means for impartinga relative movement to the frame and support, spring means for creating a working pressure between said rolls and the support, and means for moving the rolls oppositely and radially of the blank in a progressive manner while operating on the blank to effect changes therein.

A machine of the class described comprising a support for the blank Lt) be rolled and a roll-czu'rying lrame relatively movable toward and from each other, a pair of rolls ca. ricd by the frame, one at ach side oi the center of the blank, means for imparting relative movement to the frame and n'pport and for urging them together under spring pressure, and cam means for moving the rolls oppositely and radially machine of the class described comof the blank in a progressive manner while operating on the same to eltect changes of form therein. l

9. A machine of the class described comprising a rotatingsupport for the blank. a roll carrier movable toward and from said support, rolls carried by said carrier and cooperating with the blank, u torinovingsaid carrier toward the support and applying the rollsto the blank under s iring pressure, and means for moving the rolls radially of the blank. it). A machine oi the class descril'icd comprising a rotating support for the blank. a roll cooperating with said support, spring means for moving said roll toward the support to apply pressure to the blank, means for moving the roll radially ot' the blank, and means for automatically moi'ing the roll away from the blank when the roll reaches a predetcrn'iined point in its radial movement.

ii. A machine of the class described comprising a rotating support tor the blank, a roll cooperating with said support, spring means for moving said roll toward the support to apply it to the blank under spring pressure, means for moving the roll away from the support, means for moving the roll radially ot the blank, and means tor automatically returningsaid roll to the central portion of the blank.

12. Ainachine of the class described comprising a rotating support for the blank,.a frame supported above said support for vertical. movement with respect thereto, a pair of roll carriers slidably mounted for horizontal movement in said frame. a roll carried byeach of said carriers and adapted to engage a blank on'said support, means for moving the frame toward and away from said support at predetermined intervals, spring means .tor pressing said rolls against the blank, and means for moving said carriers horizontally with respect to the said support.

13. A machine of the class described comprising a rotating support for the blank to be rolled, a roll adapted to. operate on. a blank on said SllpPOlt, cam mecl anisin for raising, lmvering and moving said roll radially ot the blank in a predetermined sequence and. at predetermined intervals, and spring means exerting a working pressure upon said roll.

I l, A machine oil the class described comprising a rotating support for the blank to be rolled, a pair of rolls adapted to operate on a blank on said support, spring means for exerting a .vorkii'ig pressure upon said rolls, and cam mechanism for raising, lowering and moving said rolls radially o't the blank, toward and from each other, in a pre determined sequence and at predetermined intervals.

15. Amachine ot' the class described comprising a rotating table, a carriage vertically movable with respect to said table, a roll carried by said carriage and adapted to be moved transversely 't'hercol", spring pressure means acting on said carriage. ram mechanism for raising and lowering said carriage, and cam mechanism for n'ioving said roll transversely of the carriage.

, 18. A machine of the class described comprising a rotating table adapted to support a blank to be rolled, a carriage vertically movable with respect to said table, spring pressure means acting on said carriage, a roll carried by said carriage and adapted to operate on a blank supported on said table, and i'nechanism carried by said carriage tor raising and lowering it and moving the roll radially of the table.

'17. A machine of the class descrihed comprising a rotatably mounted table adapted to support a blank to be rolled, a carriage vertically movable with respect to the table. a pair of rolls carried by said carriage and adapted to operate on a blank supported on said table, spring pressure means acting on said carriage, and cam means for raising and lowering said carriage with respect to the table, said cam means being such as to lock the carriage in raised and lowered positions tor predetern'iined intervals.

18. A machine otthe class described comprising a frame, a 'rotatably mounted table adapted to support a blank to be rolled, a carriage vertically movable with respect to the table, a roll carried by said carriage and adapted to operate upon a blank supported onthe table, an abutment, spring pressure means interposed between said frame and said ialmtment, and means for raising and lowering said carriage including a toggle linkage connecting said carriage and said abutment and means for actuating said toggle linkage.

19. A machine of the class described com prising a t'rame, a rotatably mounted table adapted to support a blank to be rolled, a carriage vertically movable with respect to the table, a pair of rolls carried by said carriage and adapted to operate on a blank supported on said table, a pair ot knuckle pivots connected to said "frame through means including one or more springs, a knuckle member journaled on each pivot, arms on said knuckle members, links connecting said arms with the carriage and means for rocking said knuckle members on said pivots.

20. A. machine of the class described comprising a frame, a rotatably-mounted table adapted to support: a blank to be rolled, a carriage vertically movable with respect to the table, a pair of rolls carried by said carriage and adapted to operate on a. blank supported on the table, a pair of knuckle pivots connected to the frame through means including one or more springs, knuckle members journaled on said pivots, downwardlyextending arms on said knuckle members, links connecting said arms and the carriage, '1ipwarilly extending arms on said knuckle members, means connectin said upwardlycxtcmting arms whereby said knuckle members are forced to turn in unison, and means for rmking said knuckle members on their pivots. i

21. A machine of the class described comprising a frame, a rotatably mounted table adapted to support a blank to be rolled, a carriage vertically movable with respect to the table, a .pair of rolls carried by said carriage and adapted to operate on a blank supported on the table, a pair of pivots connected to :the frame through means including one or more springs, knuckle members journaled on said pivots, connections between said knuckle members and the carriage, a rocker member journaled on the-carriage, a cam acting on said rocker member, and connections between said rocker memher and the knucklemembers.

A machine of the class described comprising a lrame, a rotata-bly-mounted table adapted to support a blank to be rolled, a carriage vertically movable with respect to the table, a pair of rolls carried by said carriage and adapted to operate on a blank SHPPOIftGtl on the table, pivot members connected to the frame throughmeans including one or more springs, 21 pair of knuckle members journaled on said pivot members, each or said knuckle members having .two pairs of spaced. arms, links connecting said arms with the tour corners of the carriage, andnneans' tor rocking said knuckle members in unison on their pivots.

I 23. A 1nacl1ine ot' the class described comprising a base, a ,rotatably-mounted table adapted to support a blank to be rolled, guide rods extending vertically from, said base and connected thereto through means including pressure springs, cross rods secured to and connecting the, upper ends of said guide rods, a carriage vertically movable on said guide rods, a roll carried by said carriage and adapted to operate on a blank supported on the table, knuckle members journaled on said cross rods and con nected to said carriage, and means supported by said carriage lor rocking said knuckle members on their bearings.

24. A i'nachine of the class described comprising a base, a plurality of guide rods extending vertically from said base and slidably mounted therein, pressure springs interposed between parts of said base and the lower ends of said guide rods, a carriage vertically movable on said guide rods, a ro tatable support carried by said base and adapted to support a blank to be rolled, a roll carried by said carriage and adapted to act on the blank, toggle linkages connecting said carriage and the upper ends of said rods, and means for actuating said linkages.

25. A machine of the class described comprising a base, a support rotatably mounted on said base and adapted to support a blank to be rolled, vertical guide rods slidably mounted in said base, a plurality of springs compressed between parts of said base and the lower ends of said rods, a carriage vertically movable on said rods, a transverselyshiftable roll carried by said carriage and adapted to operate on the blank, and means carried by said rods and acting on the carriage to raise and lower the same.

26. A machine of the class described comprising a base, a support rotatably mounted on said base and adapted to support a blank to be rolled, vertical guide rods slidably mounted in saidbase, a plurality of springs compressed between parts of said base and the lower ends of said rods, a carriage vertically movable on said rods, a transversely shiftable roll carried by said carriage and adapted to operate on the blank, and camact-uated means carried by said rods and acting on the carriage to raise and lower the same.

27. A machine of the class described comprising a base, a support rotatably mounted on said base and adapted to support a blank to be rolled, vertical guide rods slidably mounted in said base, a plurality of springs compressed between parts of said base and the lower ends of said rods, a carriage vertically movable on said rods, a transverselyshiftable roll carried by said carriage and adapted to operate on the blank, cross rods connecting the upper ends of certain of the said guide rods, a pair of knuckle members journaled on said cross rods and provided with arms, links connecting said arms and the carriage, and means for actuating said knuckle members.

28. A machine of the class described com prising a base provided with a plurality of vertical passageways therein, a bushing in each passageway, guide rods slidably-mounted in said bushings and extending vertlcally above the base, said guide rods having lower i ends oi reduced diameter ilorming shoulders thereon, nuts screwed into said bushings and adapted to be engaged by rods, washers mounted on the lower ends of said rods, nuts screwed on said rods and holding said washers in place, springs'interposed between said washers and parts of the base, a support for a blank to be rolled rotatably mounted on said base, a carriage slidably mounted on said rods, a transversely-shiftable roll carried by said carriage and adapted to operate on the blank, and means carried. by said rods for raising and lowering the carriage.

29. In a machine of the class described, the con'ibination of a base provided with a plu rality of vertical passageways therein, a bushing mounted in each passageway, a guide rod slidably mounted in, each bushing and extending vertically above the base, said guide rod having a shoulder thereon nor mally located within the bushing, a nut screwed into the lower end. of the bushing and adapted to be engaged by a ring surrounding the end oi said nut and engaging a part oi the base, a pair of washers loosely mounted on the lower end of said rod, the uppermost washer engaging said ring, a spring compressed between said washers, and retaining means on the lower end of said rod engaging the lowermost: washer.

30. A machine of the class described C0111- prising a rotating support for the blank, a roll cooperating with said support, means for moving the roll radially of the blank under pressure, and means for precluding the application of a pressure greater than a predetermined amount.

In testimony whereof I afiix my signature.

EMIL A. NELSON. 

